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Solar type III burst profiles at decametre-wave frequencies

II: Exciter

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Abstract

Observations of type III burst profiles at 18, 22, 26 and 36 MHz, by Barrow and Achong (1975), are used to calculate the form of the exciter function. The burst profile is treated as the convolution of an exciter function and an exponential decay function. The average form of the exciter profile is obtained directly from calculated profiles and further inferred from the first three statistical moments. Normalised average profiles of the burst and the exciter are presented for each frequency.

The analysis shows that over the frequency range 18–36 MHz, (1) the exciter function possesses negative skewness, (2) the shapes of burst profiles and exciter profiles are approximately constant and, (3) burst peak time varies linearly with height in the corona. It is suggested that the passage of the exciting electron stream through field-dominated and flow-dominated coronal regions has different effects on the profiles.

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Authors and Affiliations

  1. Dept. of Physics, University of the West Indies, Kingston, Jamaica

    A. Achong & C. H. Barrow

Authors
  1. A. Achong
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  2. C. H. Barrow
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Achong, A., Barrow, C.H. Solar type III burst profiles at decametre-wave frequencies. Sol Phys 45, 467–476 (1975). https://doi.org/10.1007/BF00158463

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  • DOI: https://doi.org/10.1007/BF00158463

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